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4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one

Also known as: 4H-Cyclopenta[1,2-b:5,4-b']dithiophen-4-one, 4H-Thieno[3',2':4,5]cyclopenta[1,2-b]thiophen-4-one, 4H-Δ4,4'-dicyclopenta[2,1-b:3,4-b']dithiophen-4-one, 4H-Δ4,4'-dicyclopenta[2,1-b:3,4-b']dithiophene-4-one, Cyclopenta[2,1-b:3,4-b']dithiophen-4-one, 4H-cyclopenta[2,1-b:3,4-b']dithiophene-4-one

4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one (CAS 25796-77-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H4OS2 and a molecular weight of 192.258 g/mol. Key properties include a melting point of 134.0 to 138.0 °C, a boiling point of 349.6±17.0 °C at 760 mmHg, a density of 1.553 and a flash point of 165.2±20.9 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
25796-77-4
Jingsj CID
J-1355411-5
Molecular Formula
C9H4OS2
Molecular Weight
192.258 g/mol
Category
Pharma Intermediates
Last updated
8/21/2026
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Physicochemical Properties

Melting Point134.0 to 138.0 °C
Boiling Point349.6±17.0 °C at 760 mmHg
Density1.553
Flash Point165.2±20.9 °C
Exact Mass191.970352
PSA73.55000
LogP2.94
Vapor Pressure0.0±0.8 mmHg at 25°C
Refractive Index1.755

Frequently Asked Questions

What is the CAS number of 4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one?

The CAS number of 4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one is 25796-77-4.

What are the molecular formula and molecular weight of 4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one?

4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one has molecular formula C9H4OS2 and molecular weight 192.258 g/mol.

What are the upstream and downstream products of 4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one?

For 4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one, Upstream Products: 2,3-Thiophenedicarboxylic anhydride, 3-Thiophenecarboxaldehyde, 3,3'-Dibromo-5,5'-bis(trimethylsilyl)-2,2'-bithiophene; Downstream Products: 4H-Cyclopenta[2,1-b:3,4-b']dithiophene, 2,6-Dibromo-4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b']dithiophene, 2,6-Dibromo-4,4-dioctylcyclopenta[2,1-b:3,4-b']dithiophene.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one (CAS 25796-77-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1355411-5 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.